Extension drawer-slide



E. OHNSTRAND.

EXTENSION DRAWER SLIDE.

APPLICATION FILED JULY 21 l l l l l l l l l l l lH "H Patented Sept. 20,1921.

1| ll] .llllll llll UNITED STATES PATENT OFFICE.

ENOOH OHNSTRAND, OF'MOHAWK, NEW YORK, ASSIGNOR TO LIBRARY BUREAU, OFCAMBRIDGE, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

EXTENSION DRAWER-SLIDE.

Specification of Letters Patent. Patented Sept. 20, 1921.

Application filed July 21, 1920. Serial No. 398,020.

mer and State of New York, have invented new and useful Improvements inExtension Drawer-Slides, of which the following is a specification.

This invention relates to extension drawer slides, such as are designedfor the purpose of permitting a drawer to be *fully extended and to besupportedin the fully extended position.

It is an object of this invention to provide a slide of such a nature asto permit a drawer to be fully extended in either direction from itsnormal closed position. Such a slide is particularly adapted for usewith drawers in the bases of desks which are used by two persons sittingon opposite sides of the desk. In such a desk the present inventionmakes the drawers available for use by both of the two persons withoutmoving from their seats. It is al common practice to file cards of cardindex .systems in a plurality of rows crosswise of the desk drawers, inwhich case it can readily be seen that the cards can be used with equalfacility at either side of the desk provided the drawers canbe extendedin'both directions.

It has the further advantage that, when used either with such desks, orwith filing cabinets, it is possible for two persons to work at thesame-time on different drawers in the same stack, one drawer immediatelybelow the other, by sliding one out on one side and the other on theother side of the desk or cabinet. This will result in a considerablesaving in the time of filing and posting clerks or other persons usingsuch files, who often find it necessary to wait until another person hascompleted the use of a drawer just above or below the one they maydesire to use.

It is an object of this invention to provide.

a double extension slide the relative movement of the several parts ofwhich will be.

but few and durable parts with resultant economy in manufacture and use.Other and further objects will appear as the description proceeds.

I have shown a preferred embodiment of my invention in the accompanyingdrawings in which- Figure 1 is a side View of the fixed slide member;

Fig. 2 is a similar View of the extension slide member;'

1 Fig.3 is a side view of the drawer slide as seen from the extensionslide;

Fig. 4 is a cross section of the slides assembled Fig. 5 isa'fragmentary view partly in section, showing the centering roller;

Fig. 6 is a View similar to Fig. 5 showing the drawer slide catches; i

Fig. 7 is a view of one end of theslide asseigbly' showing the extensionslide catch; an

Fig. 8 is a view similar to Fig. 7 but showing the extension slide catchin operation.

The fixed slide member 11 which is preferably formed of sheet metal isadapted to be fastened to a fixed portion ofa desk or filing cabinet.Both upper and lower edges of the fixed slide are turned outhorizontally as shown in Fig. 4 and are then turned back.

the fixed slide and have extensions 14-to limit their downward movement.The bearing rollers 15 and 16 are carried by the lower edge of the fixedslide, the roller 16 being located midway between the ends of the slideand having a central ortion of greater diameter than the other ro lers.

The extension slide 17, shown in detail in Fig. 2, is formed of sheetmetal and is substantially channel-shaped in cross section being shapedsimilarly to the fixed slide and adapted to telescope therein. Theextension slide has the upper flange portion 18 carrying the fixed camstops 19 and 19 having the cam surfaces 20 and 20.

Near its upper side the slide carries the rollers 21 and 22 pivoted uponrivets extendin from bosses 23 as shown in Fig. 4, the height of thebosses giving a clearance between the edgesof the rollers and the slide.The lower flange of the slide is bowed upwardly at24 to fit over theroller 16. At either end the slide is provided with the fixedstops 25,25 bestshown in Fig. 6. 'The'= drawer slide 26 is adapted to be. at-

tached'to-the side of a drawer in any suitable manner and its upper edgeis flangedin cross-section as shown at 27 to fit over the.

.drawer slide is provided with the extension slide hook 30, pivoted to aplate 31 and having its upward movement limited by a pin 32. The lowersurface of the hook is provided with a cam 33 adapted to con-.

tact with the fixed slide 11 as shown in Fig. 7.

each side thereof. The members '11 are fastened to the inside of thedesk and do not move, while each member 26 is fastened to one side ofthe drawer and moves only with the drawer. It will be noted that thethree members, the fixed slide 11, the extension slide 17 and the drawerslide 26 are of equal length and this length should not be substantiallyless than the drawer length for the best results.

When the drawer is closed all members are telescoped together.

When the drawer is pulled out to the right, the slide 26 moves with thedrawer, and as it is drawn out the spring pressed catch 28 on the drawerslide comes againstthe fixed stop 25' of the extension slide 17, theextension slide then being drawn out with the further movement of thedrawer slide. This movement is stopped when the cam stop 19 on theextension slide comes into contact with the swinging cam stop 12 on thefixed slide member 11. The drawer is now fully extended to the ri ht.

It may be similarly extended to the fe'ft, spring pressed catch 28 onthe drawer. slide cotiperating with fixed stop 25 onthe extension slide,and the cam stop 19 on the top of the extension slide coiiperating withswinging cam stop 12 at the left end of the fixed slide member.

When the drawer is closed after having been extended to the right, thedrawer slide moves to the left with the drawer. The hooked end of theextension slide hook 30 on the right end of the drawer slide comes incontact with the right end of the extension slide 17 and carries thatslide to the left with the drawer. When the cam 33 on the hook reachesthe end of the fixed slide member the hook is lifted by the fixed slideand the extension and drawer slides move in together. The swinging camcatch 12' is lifted by the cam 20' and passes on to'the three memberscome to rest with their ends coextensive, the drawer being closed.v Thecam catch 12 similarly rests on stop 19.

In the closing of the drawer from the left the action of the slide isexactly similar, the elements coiiperating in the closing being exactlyduplicated on each end of the slides. I

The bowed portion 24 of the extension slide 17 by fitting over theroller 16 tends to retain the extension slide centrally located until itis picked up by the cams 28 or 28, the wei ht of the drawer beingcarried by the rdller 16 when the drawer is at other than its centralposition, but the portion- 24 permitting the slide to drop down so as todistribute the weight to the rollers 15 when centered.

The rollers 22 are of greater diameter than the rollers 21 and serve asboth carrying and guide rollers as shown in Fig. 4, the rollers 21'serving as carrying rollers only.

Portions of the slide 17 are cut away at 36 and 36 adjacent the ends sothat when the drawer is partly drawn out the cams 28 or 28 may bedisengaged from the stop 25 or 25 in order to entirely remove the drawerfrom the case when desired.

From the foregoing description and its accompanying illustration, itwill be clear that I have devised a double extension slide which issimple in construction, consisting of only three parts, and in which therelative movement of these parts is entirely automatic, it being simplynecessary to use a drawer in the normal manner.

I claim:

1. An extension drawer slide comprising a fixed slide member, anextension slide member of sheet material of substantially channel-likecross section telescoping within the fixed slide member. and capable ofbeing extended beyond the end thereof in either direction; and a drawerslide member movable on the extension slide member and capable of beingextended beyond the end thereof in either direction.

2. An extension drawer'slide comprising a fixed slide member of sheetmaterial, an

extension slide member of sheet material 1 and of substantiallychannel-likecross section movable on the fixed slide member and top ofthe stop 19' where it rests when the extension slide member also ofsheet material movable. on the fixed slide member and capable of beingextended beyond the end thereof in either direction, a drawer slide pcentered upon the fixed guide. 41 An extension drawer slide comprising a'fixed slide member, an extension slide and capable of being extendedbeyond the end thereof in either direction, .a drawer slide membermovable on the extension slide memberand capable of being extendedbeyond the'end thereof in either direction, and-1 a depression upon theextension slide adapt-.

ed to coactwith a member upon the fixed slide'and adapted to maintainthe extension slide normally centered on thefixed' slide.

5 An extension drawer slide comprising a fi'xed slide member of sheetmaterial, an extension slide member of sheet material telescoping withinthe fixed slide member and capable of being extended beyond the endthereof in either direction, a drawer slide member of sheet materialtelescoping within the extension slide member and ca-- pable of beingextended beyond the end thereof in either direction, 006 crating stopmembers adapted to carr t e extension slide for a predetermined istancewith the drawer slide when the latter is extended in either direction,and means adapted to carry the extension slide with the drawer slidertended beyond either end of the fixed slide, and the drawer slidecomprising an in- 'wardly faced channel-member adapted to interfitwith'the extension member, and being movable upon the extension memberin when the latter is returned to sition. I 1

6. An extension drawer slide comprising normal poa fixed slide member,an extension slide member movable on the fixed slide member and capableof being extended beyond the end thereof in either direction, a drawerslide member movable on the extension slide .afixed slide member, anextension slide member and capable of being extended 'beyond the endthereof in either direction and hook members upon the drawer slideadapted to carry the extension slide with the drawer slide when thelatter is returned from extended position to normal position,

the. hook members being disengaged from the extension slide in thenormal position.

7. An extension drawer slide coinprisin a fixed slide member, anextension slide, an a drawer slide, the fixed slide member comprising anoutwardly faced channel shaped member adapted to be attached toadesk,the extension slide comprisinga similarly shaped and faced channelshaped member adapted to fit within the slide guide and to move thereinin either direction so as to be extended beyond either end thereof, and;the drawer slide comprising an inwardly' faced channel member adapted tofit within the extension member and movable therein ineitherdirection'so as to be extended beyond either end thereof. 4

8. An extension drawer slide comprisi a fixed slide member, an extensionslide, an

a drawer slide, the fixed slide member comprising an outwardly facedchannel shaped member, adapted. to be attached to, a desk, the extensionslide comprising a similarly shaped and faced channel shaped membermember movable on the fixed slide member 5 adapted to fit within theslide guide and to move therein in either direction so as to be extendedbeyond-either end thereof, and the extension member and movable thereinin either direction so as to be extende'dbeyond elther end thereof,means to limit relative movement between the fixed guide, exten- 'sionslide and drawer slide, and means whereby, when the drawer slide isreturned from extended position ineither direction, the extension slideis returned therewith.

9. An extension drawer slide 'com rising a fixed slide member, anextension slide, and

a drawer slide, the fixed slide member comprising an outwardly facedchannel sha ed member adapted to be attached to a esk and carryinghorizontal rollers in the lower portion of the channel, the extensionslide .comprlsmg an outwardly faced channel shaped member adapted to fitwithin the fixed slide and restupon the rollers carried "thereby, andbeing adapted tomove upon the rollers in either direction 'so as to beexeither direction so as to be extended beyond the end thereof in eitherdirection.

10. An extension drawer slide comprising centered on the fixed. slideand hooks adja- .cent the drawer'slide ada ted to carry the extensionslide with the the latter is returned from extended position rawer slidewhen to normalposition and innormal position to be disengaged from theextension slide.

Signed by me at Ilion, N. Y., this 16th dayof July, 1920.

ENOCH .OHNSTRAND.

